Water pressure reducer (regulator) 

Hello. Here is a fairly good and reliable company in my opinion - far.eu/singolo_articolo.php?cp=22&cat=88&art=2845&art_univoco=56888&nome_articolo=Female-female%20brass%20pressure%20reducing%20valve%20with%20pressure%20gauge

If the pressure rises above the set value, the device will hold the set value at the exit from it.

@@CleverBill-DIY thanks for answering, but maybe i was not clear. I was talking about pressure at destination (at the outlet shower or mixer when you close it) and not at the source (water pump). Upon rising of pressure: the only way here to MAINTAIN the set value of pressure is to = completely CLOSE the prv and block the flow. In fact i just went to a shop where chinese cheap prv's are sold there. The seller told me not waste my money on them because REGULATING/AUTOMATING pressure by these is just a lie. He said they only reduce pressure by a constant value (like a manual valve) and again the fluctuating (extreme over night) pressure will continue to fluctuate but minus the constant value reduced by prv.. Do you think he is right? Or it is only a problem related to cheap brand prv?

@@atadali9711mine also having the same problem. It increases pressure itself overnight. Infact, in a couple hours

@@ngocehgayabebas2118 aha.. So it is true. Thanks

@@ngocehgayabebas2118 The in-house pressure will increase during night when cold water in the boiler is heating up and expands. This is not a pressure regulator, only reducer during tapping water. A boiler may need an expansion tank.

The title says - water pressure reducer (regulator). You understood correctly that this is the same thing, just not a regular, but a regulator, from the word regulate water pressure:)

Es lo mismo solo falta decir que la calidad del regulador marca la duración yo he tenido que cambiar 3 en 12 años Y el mas caro no ha sido el mejor

Everyone has different preferences :))

@@CleverBill-DIY Agree on that, and mine is to leave noisy channels, too annoying.